diff --git a/process/DuplicateScanner_lib/process.js b/process/DuplicateScanner_lib/process.js
index 563f3ec221917815decc1b7ce1bdc80481b5ef2d..22af6346ec91286765002ad95953652f0958f5bd 100644
--- a/process/DuplicateScanner_lib/process.js
+++ b/process/DuplicateScanner_lib/process.js
@@ -1241,7 +1241,7 @@ _DuplicateScannerUtils._getLinkedTableInfos = function(pTargetContactId)
         
     var communicationDedupCondition = targetComms.length > 0
         ? newWhere("COMMUNICATION.ADDR", targetComms, SqlBuilder.NOT_IN())
-        : null;
+        : "";
     
     return[
         ["AB_APPOINTMENTLINK", "OBJECT_ROWID"],